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SIERRA ANALYTICAL <br /> GHH Engineering,Inc. ELAP No.: 2320 <br /> 11960 Heritage Oak Pl, Suite ZB Date Sampled: 01/08/02 <br /> Auburn, CA 95603 Date Received: 01/11/02 <br /> Date Prepared: 01/11/02 <br /> Date Analyzed: 01/11/02 <br /> Sierra Project No.: 0201-122 Analyst: SM <br /> Client Project ID: USA-Stockton / 5 007.10 <br /> Sample Matrix: Water Report Date: 01/14/02 <br /> Oxygenated Fuel Additives(GC/MS) <br /> Preparation Method: Purge&Trap Concentrator (EPA Method 5030) <br /> Analysis Method: EPA Method 8260B <br /> Client Sample No.: MW-1P MW-2P MW-31? MW-4P MW-51' <br /> Practical <br /> Quantitation Units <br /> Limit <br /> Sierra Sample No.: 733 734 735 736 737 <br /> Analytes: <br /> 1,2-DCA 11 5,1 ND ND 5.2 1.0 µg/L <br /> MTBE 0.65 76 26 ND ND 0.5 µg/L <br /> DEPE 19 ND ND ND 77 5.0 µ81L <br /> ETBE ND ND ND ND ND 5.0 µ81L <br /> TAME ND ND ND ND ND 5.0 µg/L <br /> TBA ND 93 ND ND ND 5.0 ELg/L <br /> Dilution Factor 1 1 1 1 1 QC Limits - <br /> Surrogate Recovery: <br /> Dibromofluoromethane 94 93 91 92 92 80-12.0 <br /> Toluene-d8 90 91 90 91 90 81-117 % <br /> 4-Bromofluorobenzene 93 93 93 93 9] 74-121 <br /> Quality Assurance/Quality Control Data <br /> IQ C Reference No.: 020111-518 <br /> Spike pre up. I�r1:e RPD RPD <br /> Analytes: LCSo <br /> /o Rec. QC Limits % Rec. % Rec. QC Limits QC Limits <br /> MTBE 80 80 - 120 72 76 37 - 160 5.4 0-30 <br /> ND means Not Detected <br /> Reporting Limit(RL)=Practical Quantitation Limit(PQL).e Dilution Factor <br /> • <br />